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- (void)setupMemRenderBuffer {
glGenRenderbuffers(1, &_memRenderBuffer);
glBindRenderbuffer(GL_RENDERBUFFER, _memRenderBuffer);
GLint iWidth = 0;
GLint iHeight = 0;
iWidth = self.frame.size.width;
iHeight = self.frame.size.height;
glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8_OES, iWidth, iHeight);
// [_context renderbufferStorage:GL_RENDERBUFFER fromDrawable:_eaglLayer];
}